Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
IBB vs IEMG: how they differ
IBB and IEMG hold 0% of their weight in the same names, and IBB returned more over the year.
iShares Biotechnology ETF and iShares Core MSCI Emerging Markets ETF.
What they hold in common
By the books each fund has filed, IBB and IEMG hold 0% of their money in the same securities at the same weight.
| Holding | IBB | IEMG |
|---|---|---|
| Legend Biotech Corp. | 0.34% | 0.01% |
| Only in IBB | Only in IEMG |
|---|---|
| Vertex Pharmaceuticals, Inc. 8.09% | Taiwan Semiconductor Manufacturing Compa 12.52% |
| Amgen, Inc. 7.84% | SK hynix Inc. 5.83% |
| Gilead Sciences, Inc. 6.85% | Tencent Holdings Limited 2.38% |
| Regeneron Pharmaceuticals, Inc. 4.91% | Alibaba Group Holding Limited 1.83% |
| Argenx SE 3.76% | MediaTek Inc. 1.42% |
| Alnylam Pharmaceuticals, Inc. 3.12% | DELTA ELECTRONICS, INC. 1.03% |
| Natera, Inc. 2.89% | HON HAI PRECISION INDUSTRY CO., LTD. 0.79% |
| Revolution Medicines, Inc. 2.78% | Samsung Electronics Co., Ltd. 0.74% |
Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed. Above 50%, holding both is close to holding one of them twice. Holdings dated Jun 30, 2026 and May 31, 2026.
| IBB iShares Biotechnology ETF | IEMG iShares Core MSCI Emerging Markets ETF | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | iShares |
| What it is | Biotechnology | Core MSCI Emerging Markets |
| Total return, 1 year | +41.5% | +30.6% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | +24.0 pts | +13.1 pts |
| Expense ratio | 0.44% | 0.09% |
| Already in the S&P 500 | 35.6% | 0.0% |
| Holdings | 248 | 2695 |
IBB in plain words
IBB is an index equity fund tracking the Biotechnology. Over the year to Sep 11, 2026 it returned +41.5% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.44% a year. By its holdings filed for Jun 30, 2026, 36% of the fund by weight is stocks the S&P 500 also holds, across 248 positions, with the top ten at 44.8%. It sat 6.5% below its high of Aug 19, 2026 on Sep 11, 2026.
IEMG in plain words
IEMG is an index equity fund tracking the Core MSCI Emerging Markets. Over the year to Sep 11, 2026 it returned +30.6% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.09% a year. By its holdings filed for May 31, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 2695 positions, with the top ten at 34.1%. It sat 4.0% below its high of Jun 22, 2026 on Sep 11, 2026.
Questions people ask
- Which returned more over the last year, IBB or IEMG?
- In the year to Sep 12, 2026, with distributions reinvested, IBB returned +41.5% and IEMG returned +30.6%, so IBB returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IBB or IEMG?
- IBB charges 0.44% a year and IEMG charges 0.09%, so IEMG is cheaper. Fees come from each fund's prospectus.
- How much do IBB and IEMG overlap with the S&P 500?
- By their latest filed holdings, 36% of IBB and 0% of IEMG by weight is stocks the S&P 500 already holds. Between the two funds, 0% of their books are the same securities at the same weight.
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Where these figures came from
ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement.
Cite this page. ETFIQ, IBB against IEMG, data as of Sep 12, 2026. https://etfiq.com/compare/any/IBB-IEMG Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources